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Diffstat (limited to 'arch/s390/kvm/priv.c')
-rw-r--r--arch/s390/kvm/priv.c119
1 files changed, 106 insertions, 13 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index c03106c428cf..785ad028bde6 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -24,6 +24,7 @@
#include <asm/ebcdic.h>
#include <asm/sysinfo.h>
#include <asm/pgtable.h>
+#include <asm/page-states.h>
#include <asm/pgalloc.h>
#include <asm/gmap.h>
#include <asm/io.h>
@@ -328,7 +329,7 @@ static int handle_sske(struct kvm_vcpu *vcpu)
start = kvm_s390_logical_to_effective(vcpu, start);
if (m3 & SSKE_MB) {
/* start already designates an absolute address */
- end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
+ end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
} else {
start = kvm_s390_real_to_abs(vcpu, start);
end = start + PAGE_SIZE;
@@ -361,7 +362,7 @@ static int handle_sske(struct kvm_vcpu *vcpu)
}
}
if (m3 & SSKE_MB) {
- if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT)
+ if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT)
vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK;
else
vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL;
@@ -374,7 +375,7 @@ static int handle_sske(struct kvm_vcpu *vcpu)
static int handle_ipte_interlock(struct kvm_vcpu *vcpu)
{
vcpu->stat.instruction_ipte_interlock++;
- if (psw_bits(vcpu->arch.sie_block->gpsw).p)
+ if (psw_bits(vcpu->arch.sie_block->gpsw).pstate)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu));
kvm_s390_retry_instr(vcpu);
@@ -892,18 +893,18 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
case 0x00000000:
/* only 4k frames specify a real address */
start = kvm_s390_real_to_abs(vcpu, start);
- end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
+ end = (start + PAGE_SIZE) & ~(PAGE_SIZE - 1);
break;
case 0x00001000:
- end = (start + (1UL << 20)) & ~((1UL << 20) - 1);
+ end = (start + _SEGMENT_SIZE) & ~(_SEGMENT_SIZE - 1);
break;
case 0x00002000:
/* only support 2G frame size if EDAT2 is available and we are
not in 24-bit addressing mode */
if (!test_kvm_facility(vcpu->kvm, 78) ||
- psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT)
+ psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- end = (start + (1UL << 31)) & ~((1UL << 31) - 1);
+ end = (start + _REGION3_SIZE) & ~(_REGION3_SIZE - 1);
break;
default:
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
@@ -938,7 +939,7 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
start += PAGE_SIZE;
}
if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
- if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT) {
+ if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) {
vcpu->run->s.regs.gprs[reg2] = end;
} else {
vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL;
@@ -949,13 +950,72 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
return 0;
}
+static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
+{
+ struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state;
+ int r1, r2, nappended, entries;
+ unsigned long gfn, hva, res, pgstev, ptev;
+ unsigned long *cbrlo;
+
+ /*
+ * We don't need to set SD.FPF.SK to 1 here, because if we have a
+ * machine check here we either handle it or crash
+ */
+
+ kvm_s390_get_regs_rre(vcpu, &r1, &r2);
+ gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT;
+ hva = gfn_to_hva(vcpu->kvm, gfn);
+ entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
+
+ if (kvm_is_error_hva(hva))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+
+ nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev);
+ if (nappended < 0) {
+ res = orc ? 0x10 : 0;
+ vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */
+ return 0;
+ }
+ res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22;
+ /*
+ * Set the block-content state part of the result. 0 means resident, so
+ * nothing to do if the page is valid. 2 is for preserved pages
+ * (non-present and non-zero), and 3 for zero pages (non-present and
+ * zero).
+ */
+ if (ptev & _PAGE_INVALID) {
+ res |= 2;
+ if (pgstev & _PGSTE_GPS_ZERO)
+ res |= 1;
+ }
+ vcpu->run->s.regs.gprs[r1] = res;
+ /*
+ * It is possible that all the normal 511 slots were full, in which case
+ * we will now write in the 512th slot, which is reserved for host use.
+ * In both cases we let the normal essa handling code process all the
+ * slots, including the reserved one, if needed.
+ */
+ if (nappended > 0) {
+ cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK);
+ cbrlo[entries] = gfn << PAGE_SHIFT;
+ }
+
+ if (orc) {
+ /* increment only if we are really flipping the bit to 1 */
+ if (!test_and_set_bit(gfn, ms->pgste_bitmap))
+ atomic64_inc(&ms->dirty_pages);
+ }
+
+ return nappended;
+}
+
static int handle_essa(struct kvm_vcpu *vcpu)
{
/* entries expected to be 1FF */
int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3;
unsigned long *cbrlo;
struct gmap *gmap;
- int i;
+ int i, orc;
VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries);
gmap = vcpu->arch.gmap;
@@ -965,12 +1025,45 @@ static int handle_essa(struct kvm_vcpu *vcpu)
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
-
- if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6)
+ /* Check for invalid operation request code */
+ orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
+ if (orc > ESSA_MAX)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- /* Retry the ESSA instruction */
- kvm_s390_retry_instr(vcpu);
+ if (likely(!vcpu->kvm->arch.migration_state)) {
+ /*
+ * CMMA is enabled in the KVM settings, but is disabled in
+ * the SIE block and in the mm_context, and we are not doing
+ * a migration. Enable CMMA in the mm_context.
+ * Since we need to take a write lock to write to the context
+ * to avoid races with storage keys handling, we check if the
+ * value really needs to be written to; if the value is
+ * already correct, we do nothing and avoid the lock.
+ */
+ if (vcpu->kvm->mm->context.use_cmma == 0) {
+ down_write(&vcpu->kvm->mm->mmap_sem);
+ vcpu->kvm->mm->context.use_cmma = 1;
+ up_write(&vcpu->kvm->mm->mmap_sem);
+ }
+ /*
+ * If we are here, we are supposed to have CMMA enabled in
+ * the SIE block. Enabling CMMA works on a per-CPU basis,
+ * while the context use_cmma flag is per process.
+ * It's possible that the context flag is enabled and the
+ * SIE flag is not, so we set the flag always; if it was
+ * already set, nothing changes, otherwise we enable it
+ * on this CPU too.
+ */
+ vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
+ /* Retry the ESSA instruction */
+ kvm_s390_retry_instr(vcpu);
+ } else {
+ /* Account for the possible extra cbrl entry */
+ i = do_essa(vcpu, orc);
+ if (i < 0)
+ return i;
+ entries += i;
+ }
vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */
cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo);
down_read(&gmap->mm->mmap_sem);
generated by cgit (git 2.34.1) at 2024-06-20 03:29:23 +0000